Starting device for starting combustion engines



Aug. 7,192& I 1,679,492

G. PIELSTICK STARTING DEVICE FOR STARTING COIBUSTION ENGINIS Filed Sept. 14, 1925 Patented Aug. 7, 1 928.

UNITED STATES 1,679,492 PATENT OFFICE.

GUSTAV PIELSTICK, OF AUGSBURG, GERMANY, ASSIGNOR T MASCHINENFABRIK- AUGSBURG-NUEBNBURG, AKTIENGESELLSGHAFT, OF AUGSBUBG, GERMANY, A COR- IPORATION OF GERMANY.

STARTING DEVICE FOR STARTING COMIBIJ'STION ENGINES.

Application filed September 14, 1925, Serial No. 56.260, and in Germany September 20, 1924.

This invention relates to pressure-air starting of combustion engines and more particularly to a starting device of this kind whereby the valve gear of the engine is automatically kept inoperative during normal operation of the engine and operative during starting.

According to this invention use is made of a controlling piston, which is loosely 10 mounted upon the starting valve spindle; this controlling piston is intended to serve for alternately rendering the valve gear operative and inoperative and in addition to this will tend to keep the starting valve closed during operative condition of the valve gear, while the opening of the valve will be accomplished through the action of the pressure air by the aid. of an especial pressure piston, said opening of the valve being accomplished to the same extent as the controlling piston will release the starting valve under the influence of the valve gear. This mode of control has the advantage of being of great simplicity ofconstruction; in addition to this it will properly operate in a mechanical way, thereby warranting absolute reliability and efliciency of operation of the engine and its starting device. This is dueto the employment of two pistons which operate to render the valve gear alternately inoperative during the normal working of the engine and operative during the starting of the same, and to properly 0 en the starting valve.

In the diawing there is represented an example of the novel starting device according to this invention. The drawing represents a vertical section through the device, in a condition whereby the valve gear is operative, that is during starting of the engine. In the drawing a represents the starting valve and b the starting conduit, said two devices being arranged in the usual manner in the cylinder head a of the cylin der 0. The valve spindle d is kept under the action of a spring 6, which is interposed between a flange f on the valve casing f and a flange or abutment g on the valve spindle thus tending to keep the valve closed. The valve spindle is provided in the wellknown manner with a bore h and carries at its up er end a pressure piston i, which is guide within a cylinder On the valve spindle d there is in ier displaceably mounted a controlling piston 71 which is provided with an upwardly extending sleeve is. The sleeve k is provided intermediate its length with diametrically opposite slots 70 through which protrudes a pin g by means of which the abutment g is pinned to the valve spindle (Z. The abutment g is thus disposed on the exterior of the sleeve k, the slots 75 receiving the pin 9' permitting relative movement of the controlling piston is and the valve spindle d. This sleeve carries on its outer circumference a circular flange k upon which the fork-shaped arm of the controlling lever Z rests, the other arm of the lever Z being adapted when inoperative position to contact with the controlling cam m. The diameterof the controlling piston 70 is so dimen: sioned that the surface which is exposed to the pressure air is greater than the opposite surface of the valve cone, which is likewise under the action of the pressure air. term valve gear is used herein as meaning The.

the mechanical mechanism associated with y the valve and cooperating in the operation thereof, and ncludes the rocker arm or lever Z and operatmg cam m.

The operation of the device as described is as follows: As soon as the pressure bottles containing the starting air-are opened and pressure air is conveyed into the valve casing through the conduit b, the piston k will be moved upwardly upon the spindle d, the valve remaining closed under the action of the spring 6, until the sleeve is will abut against the pressure piston During this motion of the controlling piston is the controlling lever Z is swung to such an extent,

that its guiding roller Z will come into the I range of action of the controlling cam m, the lever Z during normal working of the engine being held out of contact with the cam m by the spring a. The valve will now be acted upon by the spring 6 and by the starting pressure exerted upon the surface of the controlling piston is, both tending to close the valve. while the starting pressure exerted upon the piston 71 as well as the pressure of the starting air exerted upon the valve surface will act upon the valvein a manner to open the same. Since this opening pressure is smaller than the closing prescomes into contact with the roller Z by reason of the rotation of the valve gear shaft which is caused by the remaining cylinders, the controlling lever Z will be swung about its pivot shaft, thereby moving the controlling piston k in a downward direction. The sleeve is will now have released the pressure piston z','and by reason of the fact, that the forces tending to close the valve will now be diminished by tl a starting pressure so far exerted upon the controlling piston k, the starting pressure exerted upon the pressure piston z and the valve cone will suflice to open the valve; the time of opening of the valve thus depending upon the form of the cam m. The valve on the other hand will close, as soon as the rise of the cam m has passed the roller Z of the valve lever Z. At this moment the controlling piston k can again move upward, being actuated by the pressure of the starting air, and keep the valve closed by reason of the fact that now the closing pressure will again be greater, until the procedure will repeat itself after a complete revolution of the valve gear shaft.

I claim:

1. A starting device for starting internal combustion engines by pressure air, comprising a starting valve, actuating mechanism, means urging said actuating mechanism toward inoperative positioning, and a controlling piston responsive to starting air pressure for moving said actuating mechanism into operative positioning and concomitantly urging said starting valve toward closed position during starting of said engine.

2. A starting device for starting internal combustion engines by pressure air, comprising a starting valve, actuating mechanism, means urging said actuating mechanism toward inoperative positioning, a controlling piston responsive to starting air pressure for moving said actuating mechanism into operative positioning and concomitantly urging said starting valve toward closed position during starting of said engine, means for operating said actuating mechanism to temporarily remove the closing force of said controlling piston from said starting valve to permit opening of said valve, and a pressure piston responsive to starting air pressure or opening said valve.

3. A starting device for starting internal combustion engines by pressure air, comprising a starting valve, a controlling piston associated with said starting valve and adapted to be actuated by starting air pressure to exert a closing force upon said valve,

and a pressure piston associated with said starting valve and adapted to be actuated by starting air pressure for exerting an opening force upon said valve, the surface areas of said controlling piston and said.

pressure piston exposed to the starting air pressure being so proportioned that the closing force exerted upon said valve exceeds the opening force exerted upon the valve.

4. A starting device for starting internal combustion engines by pressure air, comprising a starting valve, a controlling piston associated with said starting valve, a cylinder for said controlling piston, a starting air pressure passage in communication with said cylinder whereby said controlling piston is adapted to be actuated by said starting air pressure, an abutment connected with said valve adapted to be engaged by said controlling piston when actuated by said starting air pressure to thereby hold said starting valve in closed position, and means for effecting opening of said starting valve including actuating mechanism driven from the engine.

5. A compressed fluid starting device for internal combustion engines, comprising a starting valve, means responsive to the starting fluid pressure tending to hold said valve in closed position during the starting operation, means for temporarily rendering said holdin means inoperative to permit openin of sai valve, and means for opening said valve when said holding means is rendered inoperative.

6. A compressed fluid starting device for internal combustion engines, comprising a starting valve, a controlhng piston associated with said valve and responsive to the starting fluid pressure tending to hold said valve in closed position during the starting operation, means driven by the engine for temporaril removing the closing force of said controlling piston from said starting valve to permit opening of said valve, and means for openin said valve when the closing force of said controlling piston is removed from said valve.

7. A compressed fluid starting device for internal combustion engines, comprising a starting valve, a controlling piston associated with said valve and responsive to the starting fluid pressure tending to hold said valve in closed position, a pressure piston responsive to the starting fluid pressure tending to open said valve, and actuatmechanism controlling the opening of said valve. I

8. A compressed fluid starting device for internal combustion engines, comprising a starting valve, a rocker arm associated therewith, means tending to hold said rocker arm in inoperative position, and means actuated by starting fluid pressure for holdin said rocker arm in operative osition urin starting of said engine, sai last mentione means tending to hold said starting valve in closed position when said rocker arm is in operative position.

9. A compressed fluid starting device for internal combustion engines, comprising a starting valve, a rocker arm associated therewith, means tending to hold said rocker arm in inoperative position, means actuated by starting fluid pressure for holding said rocker arm in operative position during starting of said en 'ne, said fluid pressure actuated means ten ing to hold said starting valve in closed position when said rocker arm is in operative position, and means for actuating said rocker arm to thereby remove the closing pressure of said flui 'd pressure actuated means from said starting valve to permit opening of said valve.

10. A starting device for starting internal combustion engines by fluid pressure comprising a starting valve, means actuated by starting fluid pressure adapted to exert an opening force u on said valve, means exerting a'closing orce upon said valve, additional means actuated by starting fluid pressure for exerting a closing force upon said valve, said means being so proportionedthat the closing force is greater than the opening force when all said means are acting upon said valve, and actuating mechanism :for reducing the closing force effective upon said valve to a point such that the opening force exceeds the reduced closing force.

In testimony whereof I have hereto aflixed my signature.

GUSTAV PIELSTIGK. 

